Plate-holding device.



r. w. WESTON. PLATE HOLDING DEVICE. APPLICATION FILED MAR 31. 1911. 1,108,646. Patented AugL -25,1914,

3 $HEETS SHEET 1.

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F. W. WESTON. PLATE HOLDING DEVICE. APPLICATION FILED 11111.31, 1911.

Patented Aug. 25,191 L 3 SHEETSS11EET 2.

F. W. WESTON.

iLATE HOLDING DEVICE. APPLwA'nm FILED MAR. 31, 1911.

1 ,1 ,646 Patented Aug. 25, 1914.

3 QHEETS SHEET 3.

Mii

mm; m M

UNITED STA E S ATE enrich.

FOLKE W. WESTON, OF NEW YORK, N. Y., ASSIGNOR TO IE. VJESEL MANUFACTURING COMPANY, BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

PLATE-HOLDIN G DEVICE.

Specification of Letters Patent.

Application filed March 31, 1911.

Patented Aug. 25, 1914. Serial No. 618,051.

To all whom it may concern:

lle it known that I, FOLKE WESTON.

a citizen of the United States, and a resident of the borough of Brooklyn of the city of New York, in. the State of New York. have invented certain new and useful lmprovements in Plate-Holding Devices. of which the, following is a specification. The invention relates to new and useful improvements in devices for positioning and holding printing plates and particularly to such as are employed for supporting and holding cnrved plates.

As snowing a specific embodiment of the invention reference is tactic to the drawings forming .a. part of the specification in which i Figure l is a. partial plan view of a do vice embodying the invention. Fig. 2 is a partial vertical section on line 2--'2 of Fig. i. Fig. 3 is a partial end view of the do vice illustrated in.Fig. 1. Fig. 4 is a plan view of the plate clamping or engaging member which can be positioned in different places in the slotted portions shown in Figs. 1 to Fig. 5 is a side iew of the some showing the hand setting tool in operative position therein. Fig. 6 is a detail view of the hand setting tool. Fig. 7 is an end and sectional view of the screw threaded oper ating means. Fig. 8 is an end view of the plate clamping and engaging member with a portioh of the hand setting tool shown in operative position therein and a section of the base indicated by dotted lines. Fig. 9 is a side elevation partly in section of a mod il'ied form of that shown in Fig. 5. Fig. 10 is still another modified form. 11 is an enlarged transverse 7 vertical sectional .iew taken through one of the screw threaded operating means showing its nornml position in one of the slotted portions. Figs. 12 and 13 show in plan and partial sectional view the spring construction for resiliently supportingthe screw, operating member in normal position in the slotted portions. Fig. 14 is a partial sectional view of the base or supporting member for the hooli-shi'wving the thread cutting means in pla e thereupon. Fig. 1 is a view of a thread cutting means on the side cmkrviuf; the tap. Fig. it; is a side elevation of the thr ad (flitting means with the work or base indicated by (,luilfll lines showing the relative positions which they occupy when the in the direction of the arrows. Fig. [8

shows the relative osition of the cutting tool and the work d dring the roughing out. operation. Fig. 1% shows the relative position of the cutting tool and the work when the finishing cutis being made.

In the particular device illustrated the base is a cylindrical member l-having formed therein a series of parallel spiral slots 2 which make substantially'an angle of with the axis of the cylinder. At each side of the slotted portions are overhanging. rtions 3 on the lower adjacent sides of w ich are formed sections 4 of screw threads which are engaged by'a screw I each of the slotsthere are located a series of springs 6, (see Figs. 1113) which serve as" yielding leans for normally holding the screw tipcrating means in position in engagement with the sections of the screw threads on the overhanging portions. It. will 'beohserved that the lower portion of each of the slots'is cut away sufliciently to permitthe springs 6 to be depressed whereby the screw operating means can be Wholly disengaged from the sections of the screw threaded teeth in a manner to permit free longitudinal movement the of in the slot Without having to engage w .th the teethof the-overhanging portions. Each of the 'mrew op a series of inwardiy extending spaced openings 5 located at a less distance apart than the distance between the adjacentwalls of the overhangin po tions 3 whereby the ends of pincers 7 maybe inserted to cause the depressing of the spring and eliect ehe longitudinal movement of the screw operaiing means inthe slot when desired and at timewhen the plate engaging means which will hereinafter he described has been re--. moved.

' The plate engaging and positioning means is, in reality a clamping member 8 having a jaw-f), and spaced lugs 10 and 11. The

width of each of the lugs is preferably sub- ;dantially the distance between the adjacent surfaces oi the overhanging portions 3 so that the clamping member can be removed to and from the base by a movement transversely relative thereto when not held ofperating member 5.

In the lower portion o i in operative position on the screw operating means. 7

In the formshown in Fig. a slotted pin 12 is utilized as a means for holding the 5 screw operating means in place between the lugs but it is obvious that in place of'this construction a pin or projection 13' on one of the lugs might be provided as shown in Fig. 9 or a structure combining the features 10 above referred to in respect to Figsrfi aptl- 9 might be utilized as can be seen in Fig}. 10. FO1;GX:11npl6 in the last figure it up be observed that the projection 14 is carried on the lug 10 and that a pin 12 is also utilized for holding the screw member itivelyinplace. In the form shown in both Figs, 9 and 10 the distance between the lugs should be an amount at least equal to the sum of the overall dimension of a screw operating means and the length-whichthe' projections 13 or-l-Lextend from the inner surface of the lugs in order to permit the removal of the plate engaging or clamping member from the, base by transverse move- -ment when not held inoperative position relative to the screw operating member5. In both of-these forms the projectiofisll and 14 should be located between the screw operati clamping or engaging member in order that the hold bet'ween'the screw means'and the lug will be more positive-with the tightening of the clamping surface upon the work.

ries. ofteeth which are the sections of screw threads-all located a certain distance from theouter. surface of a cylindrical or curved body'and in Figs, 14 to 19 there is disclosed the tool or apparatus by which these teeth have. been formed; The tool utilized comprisesa mainimember or frame 20 having shortt'a 21' rotatably mounted in the ears '23: sehure to on central portion thereof. is also secured at each end of the to frame guide members 23 arranged to rest in 1 portions; located upon opposite sides ofl'th-zs ottd portion being tapped or subfected';to the action of the thread. cutting j' looks There is also carried by the frame an to overhanging guide member 24 arranged to engage same slotted portion as that --wh1ch is'subjected to the action of the tap in: thread cutting tool.

ga gle the teeth to be. formed are upon a q:-

,surface '01" at least upon a surface means and that lug which is op: sopositetie plate engaging surface ofmte which will not permit the tap to travel upon a straight line, it is preferable to make the lap coumaratirely short in order that it may follow the curratlu'e desired and there is therefore preferably employed a tap for carrying out a roughing operation and a tap preferably of the same outside diameter as the roughing out tap for performing the finishing cut.

In Fig. 18 can be seen the position which the tap occupies in performing the roughing out operation and in Fig. 19 it will be observed that a thin filler 26' clearly shown in Figs. 16 and 18 between the frame and the lugs 22 has been removed in order to bring 3 the axis of the finishin tap nearer to the portion of the framow ich is engaged by the surface ofthe work, or in other words tobii'ng and to'hold the tap in a position where its axis will be close-r'to the work 35 than that occupied by the roughing out ta and in this manner position the tap correctly for caning out the finishing operation.

It is o vious that various forms and modifications may be made without departing from the spirit and scope of the invention.

I claim as my invention:

1. in a device of the class described the "combination of a base having a slotted por combination ofa base havin a slotted portion. a plate clamping member having ears 1 o entering the same which member can be removed from the base by a transverse movement relative thereto an operating screw held in place in the slotted portion and engaging teeththerein, the screw operating 5 memherbeing' normally held in place by spring means carried by the base the'slotted portion being of such shape and the spring means of such construction that by pressing the screw member: against the spring means 0 it can be moved longitudinally in the slotted portion from one position to another and be resiliently supported in saidrpositi'ons, the screw being provided with inwardly extending holes.

3. In a device of the class described the combination of abase havin a slotted por tion, a plate engagin mem r havin ears entering the same which member can ere: 1 moved r om the base by a transverse movement relative thereto and an operating serew in the slotted portion and normally held in portions of the slotted portion.

4. The eomhination of a eylindrieal lvase loving a eurved slotted portion provided with s rew threaded portions formed into-- grral with the hase and a plate engaging :nemher operated by a screw member in the sl tt d portion whieh engages the serew threads therein.

5. The eo'mhination of a ovlindrieal hase having spiral slots therein Whieh are pro \ided with overhanging; portions having see tions of serew threaded teeth extending along, th some and a regist r hook serew operating means in said slot.

6. The eomhination of a ovlindrioal lim having spiral slots therein which are pro-- vided with orerhanging portions having seetions of screw threaded teeth extending along the same and a screw operating means in said slot, the slotted portion being so vshaped that the screw operating means therein ean he moved transversely suflieient to eause disengagement of the screw threads with the teeth and permit free longitudinal movement o'l said serew operating means from one position to another along the slot.

T. The eonihination ol a oylindrieal base having spiral slots therein which are provided with o\ erhanelng portions having see tions of serew threaded teeth extending along the. ame and a register hook screw operating means in said :t-lot, the slotted por-- tion hein g so shaped that the sr-rew operatin; means therein can he moved transversel} sutlii'rient to cause disengagement ot' the ,erew threads with the teeth and permit free longitudinal movement of said serew operating means from ne position to another along the slot, the slotted portion heing provided with a resilient means for normally lolding the serew operating means in engagement with the teeth.

"lhe winhination of a s rew o ieratina' memher and a' plate engaging memlier havino spar-ed lags one of whieh is provided ith an inwardly extending projeetion for h lding: the engaging memher in plaee upon the perating member, the projeetion eX- tending tri ill a suriaee of said lug, whieh is opposed to a plate en; 2'agin; eurtaee of th plate engagingmemher.

This speeitieation ipfned and witnessed this 28th day of Mart-h l)., 191].

F( ALKE V V PISTON. 

